Nobuo Muroya, also known by the nickname Nobu-yan, is a supporting character in the anime film GANTZ:O. He is a veteran member of the Osaka Gantz team and has successfully cleared the game four times, making him one of the most experienced players in the story. Muroya acts as the de facto leader of the Osaka team, coordinating their efforts during missions. He has short black hair and black eyes, and his calm, composed demeanor reflects his seasoned background.

Personality-wise, Muroya is pragmatic and level-headed, often taking charge in high-pressure situations. His multiple clearances have given him a deep understanding of the Gantz game’s rules and dangers, which he uses to guide his team. He is fiercely protective of his teammates and values their safety, though he is not reckless. His primary motivation is survival and ensuring that his comrades return alive, driven by a sense of responsibility as a veteran player.

In the storyline of GANTZ:O, Muroya leads the Osaka team during the battle against the Tengu aliens, a powerful enemy that appears in Osaka. He works closely with his fellow Osaka members Shimaki and Kazuo Kuwabara, forming a three-man combat unit. Muroya also interacts with the Tokyo team members, including Kei Kurono and Masaru Kato, when the two teams join forces to face the alien threat. His relationship with his girlfriend, Miho Yamanaka, is a personal anchor, and her presence motivates him to fight and survive.

Muroya’s development is subtle but notable; as the conflict escalates, his leadership is tested, and he demonstrates strategic thinking and bravery. He ultimately meets his end while fighting the Tengu alien, sacrificing himself in the line of duty. His notable abilities stem from his extensive experience—he is highly proficient with GANTZ weapons and tactics, and his four clearances make him a formidable fighter, though the exact nature of his skills is not elaborated upon in detail. Muroya remains a respected figure whose presence underscores the stakes of the Osaka mission.